use accession date instead of date available, since embargoed files won't have a date available
use accession date instead of date available, since embargoed files won't have a date available

rnathanday/dryad-repo,rnathanday/dryad-repo,mdiggory/dryad-repo,rnathanday/dryad-repo,jamie-dryad/dryad-repo,mdiggory/dryad-repo,jamie-dryad/dryad-repo,jimallman/dryad-repo,jimallman/dryad-repo,rnathanday/dryad-repo,jamie-dryad/dryad-repo,jimallman/dryad-repo,mdiggory/dryad-repo,ojacobson/dryad-repo,jamie-dryad/dryad-repo,ojacobson/dryad-repo,jimallman/dryad-repo,ojacobson/dryad-repo,ojacobson/dryad-repo,jamie-dryad/dryad-repo,jimallman/dryad-repo,rnathanday/dryad-repo,mdiggory/dryad-repo,mdiggory/dryad-repo,ojacobson/dryad-repo,jimallman/dryad-repo,ojacobson/dryad-repo,rnathanday/dryad-repo